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External Cills, Thresholds & Profile

GRP Composite Doors UK offer a range of profiles to ensure that the new composite door you buy from us is tailored to best suit you requirements. As well as our standard chamfered Veka profile option, you can also choose the stylish Veka sculptured frame detail which is very popular in both the trade and commercial markets.

External Cills

We offer a choice of 3 different size external door cills, the standard 150mm, the short 85mm stubb cill and the oversized 180mm. The size determines the projection from the front face of the frame at the bottom.

For example, a 150mm cill will protrude around 80mm from the bottom as 70mm sits underneath the threshold. All pvc cills are 30mm in height.

veka 85mm cill
veka 150mm cill
veka 180mm cill


You have a choice of 3 thresholds, low 15mm aluminium, pvc 68mm full frame and the low pvc 50mm frame. The low aluminium is just 15mm high and creates a low step over when your door is open. The low threshold is suitable for disabled and wheelchair access and is Part M compliant. It is also colour matched to the door frame where possible.

The pvc threshold means you will have a four sided door frame with the frame along the bottom, when your door is open you will have around 68mm of frame to step over. This provides the tightest and most thermally efficient weather seal as the door sits behind the frame on all four sides.

veka full 68mm threshold
veka low 50mm threshold
low ali threshold

Depending on your choice of cill and threshold, you will need to ensure the door clears the internal floor when it is open.

Internal Clearance - Distance from the underside of the threshold/cill to the bottom of the door

  • Full 68mm Frame Threshold No Cill - 52mm
  • Full 68mm Frame Threshold with Cill - 82mm
  • Low 50mm Frame Threshold No Cill - 34mm
  • Low 50mm Frame Threshold with Cill - 64mm
  • Low 15mm Ali Threshold No Cill - 14mm
  • Low 15mm Ali Threshold with Cill - 44mm

Extensions / Add On's

Extensions are available in 15mm, 30mm or 45mm sections and will be useful if the brickwork opening is larger than the maximum frame size we can manufacture.

For example, you have an opening height of 2170mm and the maximum height we can manufacture a composite door with a cill and pvc threshold is 2147mm. A 30mm extension will be required, we will reduce the frame height to 2140mm and add the 30mm extension - this achieves the desired height of 2170mm.

Contact us at sales@grpcompositedoors.com or give us a call on 01530 515160
For further information about our external doors and lead times, please contact out friendly sales team.

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